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3 years ago

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Select the correct answer. Which expression is equivalent to cos(1.4x) − cos(0.6x)? A. -2sin x sin(0.4x) B. 2sin x sin(0.4x) C.

-2cos x cos(0.4x) D. 2cos x cos(0.4x)

1 answer:

lbvjy [14]3 years ago

3 0

B is the right answer cause I did some work

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Answer:

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Step-by-step explanation:

The given equation is

$\frac{3x}{4}-\frac{1}{3}=1 - \frac{2}{3}$

We multiply each term by the Lowest Common Multiple of 4 and 3, which is 12

$12(\frac{3x}{4})-12(\frac{1}{3})=12(1)-12(\frac{2}{3})$

$3(3x)-4(1)=12-4(2)$

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Add 4 to both sides of the equation,

$\implies 9x-4+4=4+4$

$\implies 9x=8$

Divide both sides by the coefficient of x

$\implies \frac{9x}{9}=\frac{8}{9}$

$\implies x=\frac{8}{9}$

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